No, nothing new. This has been an ongoing issue for years. Does not last all day and does not happen every day. Can start as early as 8pm but usually after midnight. Usually gone before or just after sunrise. (Has occurred during daylight on rare occasions - I'm going to have to start a log just for this event!). Seems to be predominant in the summer. I see it happening to short links (PtMP) also, just doesn't get bad enough to "drop". My gut feeling has always been that it's "temperature/pressure change" related.
Ed On Mon, Aug 10, 2009 at 4:31 PM, Mike <m...@aweiowa.com> wrote: > Has the link changed completely? Or does it come and go with time of > day? Are both ends of the link at the same height? If so, the > reflection point will be roughly half the path. If not, the > reflection point will be closer to the lower antenna. Has anything > changed in the terrain at the reflection point? Are these paths > urban or rural? Could there be some new growth at the reflection point? > > If the phenomenon has not passed, it may not be tropospheric > ducting. Although ducting can persist for a day or so, if it's still > degraded, probably not. > > If the path is over an urban are it may be Rayleigh fading, or Rician > fading if the path is over trees and such. > > Did someone else show up and start shooting across your path, > especially at mid path? > > There is a wealth of knowledge on this list, but we still need some more > info. > > Did all of the 3? paths degrade similarly? > > Mike > > >Both links are using Radiowave 3' high performance antennas. One > >link is a pair of Orthogon units, the other are Trango Tlink10's and > >a third 20mi link are Trango Atlases. > > > >This scenario is setup as an OSPF 'ring'. > > > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
